Pulverizing mill and unloading device therefor



PULVERIZING MILL AND UNLOADING DEVICE THEREFOR Filed 001;. 12, 1959 E.VARKONY Dec. 5, 1961 '3 Sheets-Sheet 1 JNVENTOR. EMERICH VAR KON Y.

O W -l ATTORNEYS Dec. 5, 1961 E. VARKONY 3,011,727

PULVERIZING MILL AND UNLOADING DEVICE THEREFOR Fil ed Oct. 12, 1959 5Shee s-sheet 2 Q INVENTOR.

NEMERICH VARKONY BYGWMS ATTORNEYS,

PULVERIZING MILL AND UNLOADING DEVICE THEREFOR Filed Oct. 12, 1959 E.VARKONY Dec; 5, 1961 '3 Sheets-Sheet 3 E Vvilli!liillllloolIt!ailllilllrllllfllllliiIII;7 i

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INVENTOR. EMERICH VARKONY FIG.5

WWMSMM ATTORNEYS.

United rates aten.

3,911,727 Patented Dec. 5, 18%1 xfiee Emerich Varhony, Cincinnati, Ohio,assignor to Toms River-Cincinnati Qhemical Corporation, Cincinnati,Ghio, a corporation of Delaware Filed oer. 12, 1959, Ser. No. 845,824

4 (Ilaims. (Cl. 241-171) This invention relates to a mill for crushing,pulverizing, and mixing materials such as dyes, powders, and the like.More particularly this invention relates to a device for unloading sucha mill.

An object of this invention is to provide a rod mill or the like and anunloading device therefor which unloads the mill while the mill is inrotation. 1

A further object of this invention is to provide such a device in whichmaterial from the interior of the mill passes continuously into achamber at an end of the mill arid is continuousy returned to theinterior of the mill automatically during normal operation of the millbut in which valves or doors are provided for permitting flow of thematerial outwardly from the chamber when the mill is being unloaded.

A further object of this invention is to provide a device of this typein which a rotatably mounted discharge member is attached to an endchamber or housing during the unloading operation which rotatable memberis connected to a discharge chute for discharging the contents into aproduct receiver.

The above and other objects and features of the invention will beapparent to those skilled in the art to which this invention pertainsfrom the following detailed description and the drawings, in which:

FIG. 1 is a view partly in side elevation and partly in section showinga rod mill and discharge device therefor constructed in accordance withan embodiment of this invention;

FIG. 2 is a view in end elevation thereof, a product receiver andsupports for the discharge device being removed for clarity;

FIG. 3 is an enlarged view in transverse section of the head portion ofthe discharge device;

FIG. 4 is a view in section taken generally on the line 44 of FIG. 3;

FIG. 5 is an enlarged fragmentary view in vertical section showing anend Wall of the mill with a cap closing a discharge opening therein, themill being in operat ing condition; and

FIG. 6 is an enlarged fragmentary view of the same end wall with thedischarge mechanism in position.

In the following detailed description, and the drawing, like referencecharacters indicate like parts.

In FIGS. 1 and 2 is shown, a pulverizing mill 10 which is rotatablymounted on base frames 11 and 11a. mill includes a cylindrical body 12containinga number of pulverizing units or bars 13 (FIG. 1), only one ofwhich is shown. The body 12 is formed with an opening 14 through whichmaterial can be charged for filling the mill. A closure member 15 isremovably secured to the wall of the body 12 by appropriate securingmembers, not shown. The closure member 15 may be removed during filling.

Upright end Walls '16 and 17 are secured to opposite ends of the body12. A trunnion 18 is attached to the end wall 16 and is rotatablymounted in a bearing 19. The bearing 19 is carried by a bearing support20 mounted on the base frame 11a. An annular ring or rail 22 is mountedon the outer face of the cylindrical body 12 adjacent to the end Wall17. The rail 22 engages a pair of spaced rollers 23 and 23a (FIG. 2)which are carried by bearing members 24 and 24a respectively.

The.

' The bearing members 24 and 24a are mounted on the base frame 11.

A ring gear 25 (FIG. 1) is attached to the end wall 16 and meshes with adriving pinion 26 carried by a shaft 27. The shaft 27 is driven by anappropriate power source (not shown in detail).

Attached to the end wall 17 are diametrically opposed outwardlyextending housings 3i) and 31. The housing 39 includes an outer end wall32 and opposite side walls 33, only one of which is shown, forming ahollow chamber 34- for receiving pulverized material from the interiorof the body 12. The outer end of the housing 30 has an outer wall 35which is connected with the walls 32 and 33 and with the outside of thebody 12. An opening 37 in the wall of the body 12forms a passage throughwhich pulverized material from the interior of the mill body can passinto the housing 39 when the housing 30 is in its lowermost position.The inner end of the housing 3% can be closed by a door or valve 39. Anopening 41 in the end wall 17 permits pulverized material in the housing30 to flow back into the interior of the body 12 when the housing 30 isat its highest position and the door 39 is closed. As shown, when thehousing 30 is in its upper position, and the door 39 is closed, the door39 slopes downwardly and toward the wall 17 to direct ma terial in thehousing into the mill body. 7

The housing 31 is similar in every-detail to the housing 36. An opening12 in the wall of the body 12 permits pulverized material from theinterior of the body 12 to enter the housing 31. A door 43 is adapted toclose the inner end of the housing 31. An opening 44 in the end wall 17permits pulverized material in the housing 31 to flow back into theinterior of the body when the housing 31 is at its highest position andthe door 43 is closed.

As shown in FIGS. 5 and 6, the end wall 17 is provided with a centralopening 44 in which a plate 46-is mounted. The plate 46 carries a cone47 which faces the housings 3t) and 31. When the door 39 of the housing30 is opened (FIG. 6), pulverized material from the housing 3i) can fallthrough an opening 48 at the inner end of the housing 30 and against thecone 47 to be discharged outwardly thereby. Similarly, pulverizedmaterial from the housing 31 is directed outwardly when the housing 31is in the upper position and the door 43 is open.

An inner housing 51 is mounted on and spans inner ends of the housings30 andfil. The inner housing 51 includes an annular plate 52 attached toextensions 53 and 53a .of the housings 30 and 31, respectively. A centeropening 54 in the plate 52 receives an annular, dogcarrying ring 54a.The ring 54a carries a plurality of dogs 55. When the mill is inoperation, the dogs 55 engage and hold a cover plate 56 (FIG. 5) inposition closing the opening 554. in the ring 540. When the mill is tobe unloaded, the dogs 55 are released and the cover plate 55 is removed.

When the mill is to be unloaded, an unloading assembly 57 is moved intoposition as shown in FIGS. 1 and 2. V

The assembly 57 includes a hollow discharge chute 58 on a track 63. Theupper end of the chute 58 is provided with a flange 6 to which astationary bearing assembly 66 (FIG. 3) is attached. The stationarybearing assembly 66 supports anti-friction bearings 67 in which anannular rotatable member 68 is mounted. A labyrinth seal 69 is providedbetween the rotatable member 68 and the bearing 67 to segregatepulverized material from the hearing 67. The rotatable member 68 isprovided with an annular flange 71, which as shown in FIG. 6, can beengaged by the dogs 55 to hold the rotatable member 68 in communicationwith the interior of the inner housing 51.

When the rotatable member 68 is in this position, the

doors 39 43 can be opened to permit discharge of material from theinterior of the mill. The rotatable member 68 rotates with the millwhile the discharge chute 58 remains stationary.

During the discharge operation, pulverized material from the interior ofthe mill flows through the openings 37 and 42 into the housings 30 and31, respectively (see FIG. 1), then through the opening 43 (FIG. 6) atthe inner end of the housing 30 and through a similar opening 72 at theinner end of the housing 31, through the inner housing 51, and into theinterior of the rotatable member 68. The member 68 rotates with themill. A gasket 73 prevents loss of pulverized material as it passes fromthe inner housing 51 into the rotatable member 68. As shown most clearlyin FIGS. 3 and 4, blades 74 and 76 are attached to the inside of therotatable member 58 and rotate therewith. The blades cause thepulverized material to travel along the rotatable member to the left asshown in FIG. 4, into the discharge chute Extensions 74a and 76a on theblades 74 and '76, respectively, sweep an upper end portion 76b of' thedischarge chute 53. Adjacent the entrance to the discharge chute 58 ismounted a screen 77. The screen 77 is mounted in a frame 78, which isheld in place inside the discharge chute by pins 79, which enter loops80 attached to the frame 7 8. The pulverized material is urged throughthe screen by a wiper blade 81, which may be of rubber or the like. Theblade 81 is mounted between metal plates 82 and 83 (FIG. 3) which areattached to and turn with the rotatable member 68.

The pulverized material falis downwardly through the discharge chute 58to a receptacle or drum 84 (FIG. 1). A valve 86 is provided inside thedischarge chute to prevent flow of pulverized material therethroughwhile a drum is being mounted or removed. A handle 86a can be swung fromthe full line position of FIG. 1 to the dotdashline position to open thevalve 86. At the lower end of the discharge chute is mounted a drum headassembly 87 which overlies the upper end of the drum. A gasket 88 insidethe drum head assembly 87 is engaged by the upper edge of the drum toprevent loss of pulverized material between the discharge chute and thedrum. The drum can be held in place beneath the discharge chute with thegasket 88 engaging the upper end of the drum by appropriate supports 89,only one of which is shown.

The doors of the housing are operated by hand wheels 91 and 92 (FIG. 2).The hand wheel 91 operates gears {not shown) inside a gear box 93 toturn a shaft 94. Similarly, the hand wheel92. operates gears (not shown)in a gear box 96 to turn shaft 97. As shown in FIGS. 5 and 6, the doors39 and 43 are mounted on the shafts 97 and 94, respectively. Thus, thedoors 39 and 43 can be I opened while the unloading assembly is in placeby turning the hand wheels 92 and 91, respectively.

When the pulverized material in the-mill has been unloaded, the doors 39and 43 are closed, the dogs 55 are released so that the discharge chutecan be removed, and the cover 56 (FIG. 5) is replaced. Then the mill canbe loaded again. for another run. 7

The use of the unloading assembly shown and described above makespossible unloading of the mill without loss of pulverized materialduring the unloading operation.

The machine and unloading device described above and illustrated in thedrawings are subject to structural modification without departing fromthe spirit and scope ;of the appended claims.

between the housing and the interior of the body adjacent said inwardlydirected opening for returning the pulverized material to the mill whenthe door is closed, a discharge assembly, said discharge assemblyincluding a rotatable member, a discharge chute in communication withthe rotatable member, and bearing and sealing means between therotatable member and the discharge chute, means for attaching therotatable member to the body to rotate therewith in communication withsaid discharge opening, and means externally of the housing for openingthe door to permit pulverized material from the housing to flow throughsaid inwardly directed opening into the rotatable member to bedischarged through the discharge chute.

2. In combination, a pulverizing mill including a rotatable hollow bodyhaving an upright end wall, a hollow housing attached to said end wall,there being a passageway between the interior of the body and thehousing through which pulverized material from the body enters thehousing at the periphery of the body, there being a discharge opening inthe housing, a discharge assembly, said discharge assembly including ahollow rotatable member, a hollow discharge chute in communication withthe rotatable member, and bearing and sealing means between therotatable member and the discharge chute, said bearing means comprisingraces mounted on the rotatable member and on the discharge chute, androlling bearing members between said races, said sealing means beingdisposed between said bearing means and the hollow interior of saidrotatable member and discharge chute, whereby said discharge chuteissupported in relation to said rotating member to maintain sealingcooperation ofsaid sealing means with said rotatable member and saiddischarge chute, and means for attaching the rotatable member to thebody to rotate therewith in communication with said discharge opening topermit pulverized material from the housing to flow through saiddischarge opening into the rotatable member to be dischanged throughthedischarge chute.

3. In combination, a pulverizing mill including a rotatable hollow bodyhaving an upright end wall, a hollow housing attached to said end wall,there being a passageway between the interior of the body and thehousing at the periphery of the body through which pulverized 'materialfrom the body enters the housing, there being a discharge opening in thehousing spaced radially inwardly of the periphery of the body, thedischarge opening facing inwardly, a door for closing said dischargeopening, there being a second opening between the housing and theinterior of the body adjacent said discharge opening for returningpulverized material to the mill when the door is closed, a dischargeassembly, said discharge assembly including a rotatable member, a distodirect the returning pulverized material into said second opening.

4. In combination, a pulverizing mill including a rotatable hollow bodyhaving an upright end wall, a pair of opposed hollow housings attachedto said end wall, there being passageways between the interior of thebody and the housings at the periphery of the body, there being aninwardly directed discharge opening in each of the housings, a door forclosing each of said discharge openings, there being a second openingbetween each of the housings and the interior of the body adjacent thedischarge opening for returning pulverized material. to the mill whenthe doors are closed, there being an inner conduit mounted on the bodyin communication with the dischange openings of the housings, adischarge assembly, said discharge assembly including a rotatablemember, a discharge chute in communication with the rotatable member,and bearing and sealing means between the rotatable member and thedischarge chute; means for attaching the rotatable member to the innerconduit to rotate with the body in communication with said dischargeopenings, means externally of the housings for opening the doors topermit pulverized material from the housings to flow through saidinwardly directed opening into the inner conduit, means inside theconduit for directing the pulverized material into the rotatable member,

UNITED STATES PATENTS 1,753,685 Bodenstein Apr. 8, 1930 2,185,960Vogel-Jorgensen Jan. 2, 1940 2,367,585 Huszar Jan. 16, 1945 2,429,627Huszar Oct. 28, 1947 2,815,176 Bodlaender Dec. 3, 1957

